It’s a bit of a trite saying, attributed to coaches, motivational speakers and fortune-cookie writers. Still, its popularity illustrates the power of the idea behind it. Character is what you do when the only controlling authority is your conscience.

Because young people don’t yet have fully formed characters, they often need incentives to do the right thing. That’s one reason most parents reward good behavior and punish bad behavior — to create real-world consequences for poor decisions, and thus train the habits of the heart.

Schools do the same thing.

When I was a kid, one of the chief tools in this regard was your “permanent record.” You don’t want to get caught cheating, running in the halls, cutting class, drinking beer, etc., because it might go down on your permanent record, teachers would warn.

One of the great epiphanies in life is that your permanent record is not some bulging binder kept under lock and key like an archive in East Germany. But the threat that keepers of your permanent record were watching you — bureaucratic Santas determining if you were naughty or nice — had its uses. I’m sure it still does.

Another useful lesson in life is that jerks can avoid the scrutiny of the permanent record-keepers while still being jerks.

That’s one reason I was happy to hear that colleges have taken to perusing applicants’ social-media habits.

A Kaplan survey of top colleges, as compiled by US News and World Report (once a news organization that did college rankings, now a college-ranking service that occasionally dabbles in news), found that about a third of admissions officers at elite schools poke around on Facebook and other sites to check out what applicants are really like.

Teens in the past learned how to have a good time while avoiding embarrassing entries in the permanent record; they’ll figure it out again. “Sure, the scrutiny may make them better at hiding what they don’t want adults to see,” writes Professor Mark Bauerlein of Emory University. “It will produce the same hype and earnestness we get in personal essays and resumés in the application packet.

“Yet,” Bauerlein asks, “which is worse: social media that inflates the intellectual and moral credentials of the user and makes them more careful; or social media that reinforces the adolescent user’s adolescence?”

In other words, there will be marginally fewer Facebook photos of keg stands and more of summer vacation latrine-digging in Third World countries.

But there’s a larger point here.

Text-messaging, Twitter, YouTube, Facebook, Instagram, e-mail, etc., amount to the new permanent record. In the past, if you embarrassed yourself in some horrendous way, you could reinvent yourself simply by moving to a new town and starting fresh. Now your permanent record is in the Cloud and your scarlet letter can be found with a Google search.

Indeed, the Web is creating unprecedented opportunities for people of low character to advertise it. If Anthony Weiner had used the phone as a phone instead of a handheld peep-show booth, he’d probably be the next mayor. If Jofi Joseph (the Obama aide who used Twitter to trash colleagues and superiors) had restricted his gossiping to water-cooler chatter, he’d probably still have a job. Miami Dolphins lineman Richie Incognito couldn’t stay incognito because of the ubiquity of cellphone cameras and the permanence of text messages.

Such stories are extreme examples of the Internet culture’s tendency to reward oversharing. But they also reflect a much older and broader cultural trend that celebrates self-expression over self-discipline. That tension has been baked into the cake since the Enlightenment, and it’s not going away.

But it’s nice to see society self-correct every now and then. It’s a sign of good character.

Are you becoming more careful when using social media?

Aside from making a few comments on sites like this, I do not participate in "social media". No Facebook, Twitter, Instagram, Myspace, etc. My cellphone is 6 years old and does not have a camera or GPS capabilities. Also, using a Cloud server is akin to giving the government all your files.